Administration: Add improved context for add new links.

Consistently expand `Add New` links to include the type of content to add. Improve consistency of text casing to use initial caps throughout.

Props afercia, gonzomir, alexstine, swissspidy, joedolson.
Fixes #47125.

git-svn-id: https://develop.svn.wordpress.org/trunk@56515 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/users.php

@@ -694,13 +694,13 @@ switch ( $wp_list_table->current_action() ) {
 			printf(
 				'<a href="%1$s" class="page-title-action">%2$s</a>',
 				esc_url( admin_url( 'user-new.php' ) ),
-				esc_html_x( 'Add New', 'user' )
+				esc_html__( 'Add New User' )
 			);
 		} elseif ( is_multisite() && current_user_can( 'promote_users' ) ) {
 			printf(
 				'<a href="%1$s" class="page-title-action">%2$s</a>',
 				esc_url( admin_url( 'user-new.php' ) ),
-				esc_html_x( 'Add Existing', 'user' )
+				esc_html__( 'Add Existing User' )
 			);
 		}